OLIVE-GEEEN AND BROWN SEAWEEDS 71 



narrow lobes, the clefts extending nearly or quite to the base ; olive-green, 

 with concentric zones of darker color ; edges thin and bordered with a 

 dark line. Found in southern California and in tropical and subtropical 

 seas. 



GENUS Taonia 



T. atomaria. Spreading, fan- shaped frond ; clefts irregular and not 

 extending to the basal stem ; spores arranged in dark wavy lines and 

 spots on the frond, giving it a mottled appearance and beautiful grada- 

 tion of color. Found in tropical seas. (Plate XIII.) 



GENUS Padina 



f. pavonia, the peacoek's-tail. Frond broadly fan-shaped ; sub- 

 stance between mernbranaceous and leathery ; powdery on the outer 

 surface ; deeply and variously cleft or entire ; several laminae emanating 

 from a stalk-like base ; each lamina fan-shaped ; concentric lines numer- 

 ous j variegated in zones. This beautiful alga is always regarded as a 

 prize. It is found on stones at low-water mai'k, and is not uncommon 

 south of Charleston, South Carolina, but is more luxuriant in tropical 

 seas. (Plate XIII.) 



GENUS Haliseris 

 The sea-endive. 



H. polypodioides. Fronds flat, forked, notched on lower part ; di- 

 visions about one quarter of an inch wide ; distinct midrib ; olive-green ; 

 grows in tufts. It is found in North and South Carolina, and is abun- 

 dant on the Florida Keys. (Plate XIV.) 



ORDER CUTLERIACE-E 



GENUS CMtleria 



C. multifida. Frond erect, flat ; branches in a forking manner ; 

 ultimate branches fine and short, and with branchlets on the tips. This 

 species resembles Taonia. It is found in Southern waters. (Plate XIV.) 



ORDER FUCACEJE 



GENUS ffimanthalia 



If. lorea, the sea-thong. A cup-shaped base, from the center of 

 which arises a flat, strap-like frond one fourth to one half of an inch 

 wide and two to twenty feet long, branching dichotomously (or by 

 forking), and dotted with pits, or conceptacles, in which the spores are 

 formed. Found in the extreme North. 



